Internal-combustion engine



W. I. DUNN. .INTERNAL COMBUSTION ENGINE' APPLICATION FILED f Patena May10,1921.

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Application filed March 5, 1920. Serial No. 363,625.

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Be 1t known that l, VILLIAM J. DUNN,

v a subject of the King of Great Britain, and

resident of the city of Montreal, in the Province of Quebec and Dominionof Canada, have invented certain new and useful Improvements inlnternaLCombustion Engines. of which the following is a full, clear. andexact description.

' rl'his invention relates to improvements in valves for internalcombustion motors, and the object of the invention is to provide asimple and 'easily constructed valve geancomprising a minimum number kofparts. Y

A further object is to provide for the quick `intake and release of gasto enable an engine toy operate eiiciently at high speed.

it. still further object is to provide means for efficientlylubricatingr and cooling the valve gear.

The device `consists briefly of a jacketed head containing a pair oftubular valves.

conduits are connected to one end of said valves and a driving mechanismto the opposite end, so that the valves may be rotated Within the headto bring ports therein into and out of communication with ports in thehead. Means are provided for lubricating the valves throughout theirlength andalso for insuring a flow of (tooling medium uniformly around.the valves.

ln the drawings which illustrate the invention:

Figure 1 is a fragmentary vertical cross sectional view of anengine, in.the'central plane of one of said cylinders.

Fig. 2 is a longitudinal section on the line 2 2, Fig. i.

Fig. 3 is a fragmentary plan View.

Referring more particularlyto the draW- ings, 11 designates thecylinders of an engine provided with a Water jacket 12 and preferablycast ea 6200. 13 designates a cylinder head having a Water jacket 14cornmunicating with the cylinder jacket. Within the head jacket, andsuitably supported, is a longitudinally disposed tubular portion 15having two bores Apreferably arranged axially parallel. VEach of thesebores is slightly tapered from end lto end, as clearly shown in Fig. 2,and each bore opens through the ends of the head. lWithin the bores areievolubly mounted tubular valves 16 and 17 having ports 12 and 19 formedthrough the waits thereof and positioned to Specification of LettersPatent.

INTERNAL-COMBUSTION ENGINE;

Patented communicate with ports 20 and 21leading through the head to thecylinders. The length ofthe ports 2O and 21 is substantially equal tothe diameter of the Acylinders and the ports are located as nearly as'poslsible on the diameter of the cylinder. lin

order to reduce as much as possible the volume or capacity of theseports and to re duce the size of openings in the cylinder head Withoutrestricting any of the ports these ports may be inclined and allowed tomerge Where they communicate with the cylinder as clearly shown in Fig.1.

llt will be noted that the Walls of the valves are of uniform thicknessthroughout and also that the-Walls of the part 15 inclosing the valvesare as'much as possible of uniform thickness throughout in order toinsure uniform expansion and contraction and thus avoid imperfectfitting of the valves. A

An oil passage 22 is provided in the part 15 parallel with die valves.Duets 23 are provided radiating -from this passage and communicatingwith thefvalve receiving bores at points between the ports, so thatthleducts Will never bring the interior of thevalves into communicationwith the oil passage. An oil supply pipe 2l`communicateswith one end ofthe passage andan overHoW pipe 25 with the opposite end. @il ispreferably supplied from the crank case of an engine may io. iaai.,

or any suitable reservoir by means of 'a pump connected to the pipe 24and the surplusfof oil allowed to return to the crank case or reservoirthroughthe pipe 25. ln

vthis Way there willalways be an adequate by any suitable means such asagear 28 Y which may be connected by a chain with the crank shaft. I

- ln order to insure adequate and uniform cooling of the valves, a rib29 is provided extending from the part. 15 to the top of the headjacket, thus dividing the jacket longi- E sure a uniform flow tudinallyinto two parts.

A cooling medi/um outlet is provided at one Aend ot the head. The rih 29preferably extends into this outlet to at least the end of the head, soas to inoi' cooling` medium up each side of the cylinder block and overeach valve.

While the device has been illustrated only as applied to an enginehaving two cylinders, it will be obvious that it is in no way'liml itedto any particular number of cylinders.

Fora four-cycle engine, the valves will obviously be driven at half thecrank shaft speed and for a two-cycle engine at crank shaft speed. Foreach type of service, the ports will obviouslyv require to be suitablyproportioned to insure proper area of opening and proper duration ofopening.

The operation of the device is as follovvsg--The valves are revolved bypower taken from the engine shaft, the incoming gas' flows through onevalve and at proper intervals througlrthe ports of this valve and theports 2() into the cylinders, Where it is compressed and exploded in theusual manner. r1`he exhaust gases flow at properly timed intervalsthrough the ports Qiand 15) into the valve 17, manifold 26. ont the,engine, oil is circulated under pressure through the passage 22 and acertain proportion of it flows through the ducts 23 and from it throughthe' During the entire operationv two parts, a circulation-is compelledaround each of the valves. n

Having thus described my invention, what l. ln an internal combustionengine. a cylinder, a head therefor, a pair of tubular valves revoluhlymounted in said head, ports in the valves and head, means at one end ofthe head Jfor revolvingl said valves, and a single maini'fold memberattached to the opposite end of the head having inlet and outletpassages therein communicating` with the respective valves, saidmanifold holding` the valves in operative position in the head.

2. In an internal combustion engine, a cylinder, a head therefor, a pairof valves located in said head, ports between the valves and-cylinder,said ports merging into one another adjacent their entrance into thecylinder, whereby a single port opening is presented to the cylinderhavin` an 'area substantially the same as the-area of either of saidports.

ln Witness whereof, I have hereunto set my hand.

WLLIAM J. DUNN.

